diff options
Diffstat (limited to 'kernel/irq/migration.c')
| -rw-r--r-- | kernel/irq/migration.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/kernel/irq/migration.c b/kernel/irq/migration.c new file mode 100644 index 00000000000..6bdd03c524c --- /dev/null +++ b/kernel/irq/migration.c @@ -0,0 +1,52 @@ +#include <linux/irq.h> + +#if defined(CONFIG_GENERIC_PENDING_IRQ) + +void set_pending_irq(unsigned int irq, cpumask_t mask) +{ + irq_desc_t *desc = irq_desc + irq; + unsigned long flags; + + spin_lock_irqsave(&desc->lock, flags); + desc->move_irq = 1; + pending_irq_cpumask[irq] = mask; + spin_unlock_irqrestore(&desc->lock, flags); +} + +void move_native_irq(int irq) +{ + cpumask_t tmp; + irq_desc_t *desc = irq_descp(irq); + + if (likely (!desc->move_irq)) + return; + + desc->move_irq = 0; + + if (likely(cpus_empty(pending_irq_cpumask[irq]))) + return; + + if (!desc->handler->set_affinity) + return; + + /* note - we hold the desc->lock */ + cpus_and(tmp, pending_irq_cpumask[irq], cpu_online_map); + + /* + * If there was a valid mask to work with, please + * do the disable, re-program, enable sequence. + * This is *not* particularly important for level triggered + * but in a edge trigger case, we might be setting rte + * when an active trigger is comming in. This could + * cause some ioapics to mal-function. + * Being paranoid i guess! + */ + if (unlikely(!cpus_empty(tmp))) { + desc->handler->disable(irq); + desc->handler->set_affinity(irq,tmp); + desc->handler->enable(irq); + } + cpus_clear(pending_irq_cpumask[irq]); +} + +#endif |